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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49e61708064a2dd1dd07077be8f21d9324f2321fa5cb2f2f0874bf744d460802' 
  AND token = 'ul2FHS1f5LvfxIRKlWqvQtiRMfplubxb3AgHduxVgtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}