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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2562746dfb05ac441c39152c2578ca7f56848cb58665053bbf9b5d390d94a526' 
  AND token = 'l0moA4VQVmCWG0EE8VMGrNs6C9LCfrBSgjB/vP7Xpoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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