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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25cee56c4b2e4da1a115e16b6675d2208c159b1383443987ca6544fe59fd469e' 
  AND token = 'rrWVJe94zM5W6quydyn42SIk6rQAFnQCpkeGCSpxUW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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