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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9d3908436f254e0495fafa3e49f460e79be3b5cfd483695061df8dead1e42f' 
  AND token = 'oqOrcmiaJFlHVa7g8JJ+B652e0Lxgnn+QAnxhbCvUNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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