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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baea9f4e22f31cc599df0c00c4a239d722bdb78f6d3c993fbe14bec5159d0e3a' 
  AND token = 'wUSpL72fjZ2b2bt8eaS1osmfrHZwoCNOq39J6oMLmNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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