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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c967c8c681d41fc9995f06c00596521e0d3a6de6a53881f9c93b02d1051c1a9' 
  AND token = 'v7jEr/yVqkHOViHw3/LOarAK3EktftYlsCL5WlMfS24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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