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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbfc2e275e35fb307b54cba18957520a12a7e69c3269b135ebff8df102bbc360' 
  AND token = '7c9tehPtqMoQ7RFlB54RK69dpUuMvHIBonISuXJT+n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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