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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee4a98b5f7a87730d63a99cdb5208ef84c4f56e8f8b6da43ac98478f86c7fbc' 
  AND token = 't9uMfg2io8iA0NP4oyOTabv9deGMaNe5TMgIseveONc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00159

JSON explain

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