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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894aa0ff8404eef050d9470a334d6bce77044b4c8941e14bdac1948d11049b3a' 
  AND token = 'R7mtM+TSoiLdYMS84DzUucVTki3l7NRQeX5njDeed3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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