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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3472d361507bcf05e9216b2e4ef025143c7c9b969b2b17801642b226c52298' 
  AND token = 'vqy+i/pClJVK2QakPQOe6AZFx2AE3wcsdxmFxuzrbBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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