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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32eb7a4a464e214ca2066a991c6f0e8828bad895bfa76e01998ddb93f2d9ecc4' 
  AND token = 'GndhlNWKKmK/54b5AY8abUYPOnFNcYtqHJ49/ryaEyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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