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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb713024653af1c2f31cce13432f3d3cf5a74111fb07a6e0d6cd0fa4da78d0c8' 
  AND token = '2eEkMmU14YsEFx+hw3KpQ51ezXId06YQm/hWRhyeT9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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