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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faaafd2e3d10fa49cf9177e4c5bc7ad2421a8afd9f1f22af02d65bb1c51f278d' 
  AND token = 't2fmGYllAzpzBUV1D6mY0wqVsuwMASF9EosNzc4OV58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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