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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb0e91af6b976042c2bc0d2745d6e463451d70a1bb85b92ced4419f6cee4123' 
  AND token = 'ekrrda80Es7tHzdA1EAAuTMwGTXMCcgjJaBwobBaOfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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