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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcab17bfde7c1a20b462d6f4bc5916e492fd60e2750569808b98ab599a972774' 
  AND token = 'vDU0FZtnwoxQHYkKfoDQS5k6uPbSQ99MTlnE3zTlAJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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