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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0f71c9529bed449053dab87c8a03124dc2a1d73c3b1c9d121121ce3f7c3901' 
  AND token = 'JY3pfJqWJ1kE/Igei+3+AMAIjdkbIYOUnzILfFPDY7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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