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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57877c9b038ed8741923ea198599f564b711539344b2fc3fcff1f6e3a4795a3f' 
  AND token = 'zHV7MbbSy2GH7S1sEs1k7BBTA8f7qZLWq39ngKNCsSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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