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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53337fb6116a7ba7e04c6217a2acd877d6dc3a1bb565d154c24770a6b71f6e3d' 
  AND token = 'mPsUGwApW7Fhmo5CCaskQYKuL/OkZHYsZ+qk4UCkA+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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