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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd94c62d335e0cdbd1b393fab50f875bd74ed730222f7cb9b188d5563ecb4a31' 
  AND token = 'L2FfXhK2R+4yIua6hwLIcLcmYsyy8cVr4m76V7h6WC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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