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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c98bf96a0dbd94b4cc518ba8b4847c3ebe7b9857898b274b82ef3ae7322f8d' 
  AND token = 'qX1brbAPANZnefZ3b2ibd4DP9UIfESd9VGBDEoe9z18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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