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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3977b62b7fc9315bf6db60965475873586120ba95a2c781f7b2f9bad560f3c12' 
  AND token = '7Uk5qWIGBJFVdcjZk4aUf+uYa2Ym3nAatkSOoJsrlhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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