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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c969a99dffec63f5e73beb1819d9977e48148d496c0e5a2839f983c833633eb4' 
  AND token = 'kQae5+kqCVg0h3Fx50SRkx4ozSuyaLRLtZt07YJNazw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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