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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90daddf3ef1835781f6ff1e6458de9e6859f0ac61331bc905feab37d7327e0e' 
  AND token = 'cxiodvdnkh2p4B6yJZiYx8VdCryc+W/qHe8iMjsCRB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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