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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7c3276f02db0ff038efbfbde7563343f55c531161706cf475d816a041ad8a7' 
  AND token = 'n7ar5m9ZKO4ntMz5oun4+bjnKbWa06+buBPz0rUKtvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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