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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c92b05a3ad5b35d44978cafc0028b91012ca467c741e1bac20dc08d9f891857' 
  AND token = 'SKEuESswYWpChwS/OrvSzS4RN2NBOZGk8vTwY1ak4Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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