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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6a4c6c01db6dbc8552a83c955338db7702e8befb7eb7676ebf4900c2dc540e' 
  AND token = 'vWSM6i1i/Af+OqTMH5gDSY80rXp8P01LpyJ0M2miPlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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