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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eea93324ee612d637a20e3152a950e50a07f808ba4580f6e5e8d804fceaebab' 
  AND token = 'uRrS7LUZirUMuqu/Wx2X5BJaOhDYlK7Ub5P6lpegyvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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