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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d9e6ae13a0bcff85e6d0b9208158ee5f642d585fa8c6c3064e323bd28866eb' 
  AND token = 'ZY8u73f/RtvrQ57EJR6WEYqh9DO021awhyJp4uv31gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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