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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a808ea8c9c32ed4ee1c3b0e29ee21fe219cd1e847176799818803fccf6656e2e' 
  AND token = '+gs0uw21XG7jvAyT2l/Bw6M0ZOkVJVGhbAcEn5LTXQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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