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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413b458b5155bad653ef013781ff9765fb8c5e47854c2bebf2be0d131f439b8a' 
  AND token = 'laJg5MZPf2qESc+V4ioApc2DhtEf6RMsjZ1DePkYxLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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