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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc32923b88dfd0df570069e0b747da93a2a20e0138a6de074576c233edc9547' 
  AND token = '00RJvZtYTKpcyHNmTI0/YT91e8VS1gsxT6Nc9QQ68RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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