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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5285aa47e2a521484a30c49ca9e291b85dbe6f1fff151f85d6801824b48200a4' 
  AND token = 'ofrVrj2RDke1Lr4QwVbukJoPXVUnHGajzDqw73VsjDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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