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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b0a2c33a5fe46f6cae4908727882809dc36f1771f6a0b1f7aad80e3d713f75' 
  AND token = '0v2HWGek0fq9oQYTi81aJjcI2OYHq7lZsEhJHrgl/yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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