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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c344553ecfec0e1f270cbccad9fb9eb98b77e4c3f97a3ff51c2f0160e6c31fa3' 
  AND token = 'ADFD0CInRdNDt3XoH9HoPF63i1CqYks41wThG3rApn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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