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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de51c9ee79c9ebe86a3e0664c6924502150e8e444cb0adda44012dcb5f83d4e' 
  AND token = 'aepew2rG/Ybo6CuLFMqiCTj2N4N5pawIbFvPdBLbKAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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