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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc624734e13352de3333c8b208a2fb8b6a490c9943b494556322b4d4ca0ce86' 
  AND token = 'ID8lyRIm3yMo0O6rV1M5bj1CliqbGheUevWa9xnCmL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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