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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a26bbe64d8d233c6134b3c1f20fe18428794106ee3df62c5d0d6cac4e7aa25d' 
  AND token = 'X/f2twDYgd5AvqBPtUSuTxr64kplwuF0HnrbSmjkRoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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