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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170f7153f7464f2c1bfb3cabf7a8ccb563b7d964f8f3c1e5dd2a3557507d6081' 
  AND token = 'kk8dwAZJyy07gcxT6Ca3Zo81YmSfBVDttJKeNVtgVD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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