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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed02cd8c3da2cf0e1f90093740f180c35a4fab63a147326f1fe938b56441ed95' 
  AND token = 'tWbDiGLVs6EvH083fXCF/Bm0Aab8EeMcmv3XYtdCJqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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