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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42f32999e609d40e12219cd7f64b645836fef75b3ddb651ca316e4b5fc16308' 
  AND token = 'ZugavTQrEet+19DrYEcbrauUaQdQq6boEoWbVon5FH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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