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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ab4ba872d978bf41c16464af6a1c479d0c9cb74ef785f2d90f5b37231e75a1' 
  AND token = 'Qa+b6vf64/mafy/0q6D/GBc42Io+Zz/ssUR8PXs7al8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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