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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9b7efced1c52cd9016ac0c01d33143d79aaeb988dbfb1a0b48f5aba54abd2f' 
  AND token = 'ZvP8ioUTr1wM7jgMNE8zV9QmcULs+LGzDoag0UOIXy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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