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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab3ecb73b61c988973fe39e987b3c85f4db12ece6c29f8a0f22bf7dd0e087aa' 
  AND token = 'yStzR+xPH1sIQgIPtDySLXtY/G3Y19j+bt69zR2+W5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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