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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ee857a15eb0d60914062c1b49859d120e54f0344c556eb94a5cb8251ad1e56' 
  AND token = 'GzEKIOdznHdjcIx7cIRMu2ual9CAUf2qoxO5YBhESlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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