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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d07959b706e427b5fcba9292c342c05c323f4ad3982c48147766c53ed1ba6e' 
  AND token = 'PAT0Ut7orEtrDK8aLzXUEIyrwVhj/wVufIUG7B45Jbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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