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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81dcb5325980fa74282f1a350d035e33a98103f0cd1354cdabf40bd5e4122ee' 
  AND token = 'WvEqgR8vSN0ac402t1GqwLWK/BR674pOlO643nG4OR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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