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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d7b3fef1597f785f6d0453cdc71fd32bd0e4f4e9a361ec0ec408a2c0d2151d' 
  AND token = 'WIo5vrgkChISzjuCrZ3/B3t2jl5unDEual8GtIaV5RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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