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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0caedd858b26a5186052117143f5bd9258787848608712e3a945729a55ce270d' 
  AND token = 'qgC4cJXm9UQ+6+6U8lVcR1/QLbLQfDyJZ69gwPLav60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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