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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7db42ce7ebb4b480766792487c4dd5a2c5a33766791104296b3df04fc34c84' 
  AND token = 'uDVNelXQ9vH9ehUKaKC1tVVEH4rig1uIyIrX3qDApao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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