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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9e09836180d0185eac3778b038dcaad14e0e83f1a4485365ec62ba229bb307' 
  AND token = 'fzUKhwHJ/3c3vSDbyNtDkLn4DAutxPF30D/bP0AFR1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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