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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bccbbc4de1912f6457447ed06a5e0ab1ff7e3afe50b09139bfa96dbcd593e01' 
  AND token = 'D6w88Fedd4yRddT5zOY1Lhp7Szwz3ZDX7Npbv0GfQzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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