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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1bcf84786cb3359969e7596453e3e778d08c8abe4a1ecec7e254551cb68774' 
  AND token = 'mFxMnjcNphsz58PF16mNeSIwTPj9kdRamrYM9sHtxtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 2.95051

JSON explain

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