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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2b77ed9d783baa6317fce1a14fd3000da25b60caf1622fc5b32d234b1b0e99' 
  AND token = 'YQey+KqhIMUaKNwgmhaOry9IcvMc/x/QSBMRHLzkMXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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