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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770547e548a9a2ca755e7349d538290bd65f2d7c01ea2f5eb00cce424718a19e' 
  AND token = 'gXFkoMg7/qGrEPAhxppdaA82F95SVtoDx2cNj5ev0I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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